Jquery TinyMCE不保存区块报价

为什么TinyMCE不断剥离block引言标签而不将其保存到数据库中？我已经将它和其他元素一起添加到valid_elements列表中(顺便说一句，这些元素都有效).出于某种原因，只有block引言标签没有被保存，我很困惑为什么.

这是我的代码:

tinymce.init({
        selector:'#editor',
        height: 500,
        plugins: [
        'advlist autolink link image lists charmap print preview hr anchor pagebreak',
        'searchreplace wordcount visualblocks visualchars code fullscreen insertdatetime media nonbreaking',
        'emoticons template paste help'
        ],
        image_class_list: [
            {title: 'Responsive', value: 'img-responsive'},
            {title: 'Circle', value: 'img-circle'}
        ],
        relative_urls: false,
        toolbar: 'undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | ' +
        'bullist numlist outdent indent | link image | preview media fullpage | ' +
        'emoticons | help',
        menu: {
            favs: {title: 'My Favorites', items: 'code visualaid | searchreplace | emoticons'}
        },
        menubar: 'favs file edit view insert format tools help',
        valid_elements: 'p,blockquote,div[video-container|class],iframe[src|width|height|title|frameborder|allow|allowfullscreen],h1,h2,h3,h4,h5,h6,ul,ol,li,span,figure,figcaption,a[href|target]',
        extended_valid_elements: 'img[src|alt|title|width|height],blockquote[class|style|cite]'
    });